Electric soldering-iron.



E. SCHWARTZ.

ELECTRIC SOLDERING IRON.

APPLICATION FILED FEB. 14. 1918.

Patented Dec. 17, 1913.

r IIIIIIIIIIIIL Inventor:

MM A 5 UNITED STATES ENT OFFICE.

EDWARD SCHWAItTZ, OF NEW YORK, N. Y., ASSIGNOR TO MANHATTAN ELECTRICAL SUPPLY CDMPANY, OF NEW YORK, N. Y., A. CORPORATION OF NEW' JERSEY.

ELECTRIC SOLDER ING-IRON.

Application filed February 14, 1918.

To all whom it may concern Be it known that I, Emilio) Scnwan'rz, a citizen of the United Stairs of America, residing at New York, in tin county and Stateof New York, have invc: ll 11 certain new and useful Impmvement 11 Electric Soldering-Irons, of which the I'Wowing is a specification.

My invention relates to electric soldering irons and the object of my .invent-ica is to provide an improved construction for tools of this type, the particular features oi" which one set forth in the following speciliw-lion and claim and in the accompany inz; drawings, in which-- Figure l is a longitudinal sect ion through a soldering iron in which my invenlii-ai is embodied in one form.

Fig. 2 is a transverse section on the line 22, Fig. 1;

Fig. 3 is a partial lon itudinal section on the line 3-8, Fig. 2; ant

Fig. l is a transverse section on the line 4e 1, Fig. 1.

The construction here illustrated conipriscs a soldering point 10, shouldered at 11 lOfOl'lll a seat for the tubular casing 12 secured thereto by a set screw 13. A reduced shank ll extends some distance into the casing and affords an annular space between its periphery and the casing to receive the me tallic sheath or spool 15, the short flange 16 at one end of which abuts against the shoulder 17. A resistance coil 18 is wound upon the sheath 15 and insulated therefrom by any suitable means. I have found most suitable for this purpose a thin sheet of mica, which is not only an electrical insulator, but also a good conductor of heat. After the resistance coil 18 is wound thereon. its spires may be spaced apart and insulated by an insulating cement applied as a wash. A second thin sheet of mica (optional) may then be wrapped around the coil and a. final wash of the cement applied to hold all rigid. Inasmuch as the cement is a relatively poor heat conductor, this has the efi'ectof not only keeping the casin 12-cool at this point, but also forcing the cat from the coil inward to the core '14 where it is wanted.

At one end, the sheath 15 is pierced to afford ingress and egress for the leads to and from the coil. To insulate these loads 19 and 20 and hold them in spaced relation agamstshort circuit, I provide an insulating Specification of Letters Patent.

Patented Dec. 17., 1918.

Serial No. 217,166.

plug 21. the ends of which enter the holes in the sheath and which is itself provided with passages opening through the ends of the plug to receive the leads. The latter may be connected in any suitable way to the source of current. I have here shown them soldered at 22 to wires '23 and 24 passing through a spacing block 25 of insulation and insulating casings 26 and 27 to a terminal block of insulating material, socured by a cross pin 29 to the opposite end of the casing 12. lassa 30 and 31 extending lO'llgllllltlllltllly tirough the insulating block 28 open to the ledges 32 and 33 on which are mounted the binding posts 34 and 35 by which the wires 23 and 24 may be connected to the terminals of the power cable (not sh wn). The manner of connec tion to the power cable is, of course, immaterial, and instead of the binding screws 34 and 35, I may employ receptacle terminals to cooperate with the jacks of an attachment lug at the end of the power cable in well understood manner.

The tool is held during use by a handle 36, preferably of wood or of other material of low heat conductivity, into the bore'of which the casing 12 extends and to which it is readilyattached by means of a ferrule 37 which screws onto a threaded ring 38 se cured to the exterior of the casing.

It will appear from the a'bove description that the tool com rises relatively few parts and that each 0 these parts is selfcontained so that upon injury to or exhaustion of any of said parts it may be replaced without difiiculty and without dis carding the entire tool. Thus a new point 10 may be substituted by merely removing the set screw 13, withdrawing the old point and inserting the new one in its place. In case of injury to the heating unit, the sheath 15 carryin the resistance coil may be removed o ily and a. new coil substituted. In case of breakage of the handle 36, the latter is readil *rep'laoed by a new one screwing onto t e ring 38 in like manner. Should the casin 12 become dams. it may be readily rep aoed by disconnecting the wires from the binding screws 34 and 35 so that the insulating block 28 may be drawn off with the casing. It will be noted further that the casing 12' comprises a onepiece tube, one end of which abuts against the shoulder 11 on the copper point, while the other end is drawn down to a stem of less diameter adapted to enter the bore of a handle 36 of convenient size. The arts of the device may 'be readily manu actured at relatively low expense and they may be expeditiously assembled.

Various modifications in details of 0on struction will readily occur to those skilled in the art, which do not depart from what I claim as my invention.

I claim An electric soldering iron havin a solder ing point with rearwardly-exten ing, integral shank of slightly reduced diameter, ametallic spoolsleeving on said shank, a resistance coil wound on said spool, 0. lug of insulation in the end of said spool t rough which the coil ends pass, a solid, tubular casing surrounding said spool and coil and abutting against the soldering point and extending, with reduced diameter, toward the opposite end of the tool, a plug of insulation in the reduced end of said casing, wire terminals mounted on sald 'ilug in the reduced easing end and wire leads passing therefrom throu 11 this plug and casing to the coil terminaFs at, the plug in the spool end, together with a handle of low heat conduced stem of the casing and inclosing the wire terminal plug, substantially as described.

In testimony whereof I have signed my name to this specification.

EDWARD SCHWARTZ.

" ductivity moilnted on the end of said re- 

